Wasteate flutter?

[Treecrusher]

Hey all,

Ever since I bought my v5 wrx it has had this noise that sounds like a little hammer is tapping the exhaust very quickly. The noise happens on partial boost and stops once it hits full boost.

From what I can gather it is the waste gate vibrating against the turbo housing when it is partially open. Caused by the lack of back pressure because the cat has been removed. Does this sound correct?

Some forums say to add some pre-load to the waste gate by shortening the actuator arm, but will this cause boost spike?

Has anyone have/had this issue and/or have any other ideas to fix it?

Cheers,

[wrx_lou]

I could be wwaaayy off, but isnt that what det sounded like? And i also thought you could stop w/g flutter by moving the BOV.

[Guest boostin]

Det won't rear its ugly head on part boost. Its not heat shield rattle is it??

[Treecrusher]

Yea, don't think it is detonation because it isn't rev specific, but depends on boost and only part boost. As soon as I nail it the noise goes away.

All the heat shield has been taken off so it can't be that

As for moving the BOV, everything is factory (apart from exhaust) so where wold I move it to?

[pl0x]

my external use to kind of flutter when on half boost, was just between where the waste gate would open/close

[Guest keltik]

My single turbo GT made that noise with its modified downpipe and TD05, i always thought it was the wastegate but never managed to prove it. Sounds like theres something rattling/tapping in the exhaust under boost right?

[BC5RA]

 Treecrusher said:

Some forums say to add some pre-load to the waste gate by shortening the actuator arm, but will this cause boost spike?

This is an old school Turbo way of raising boost pressure, you could also put a spring on the actuator which is also old school.

Don't do it.

[Treecrusher]

 keltik said:

My single turbo GT made that noise with its modified downpipe and TD05, i always thought it was the wastegate but never managed to prove it. Sounds like theres something rattling/tapping in the exhaust under boost right?

Yea thats it, sounds allot like a rattly heat shield. But without heat shields that is impossible.

I'm confident it isn't hurting anything. The noise just annoys me

[Guest boostin]

Up-pipe heat shields?? They're a b*tch for breaking welds and rattling.

[Treecrusher]

 boostin said:

Up-pipe heat shields?? They're a b*tch for breaking welds and rattling.

I'll double check the up pipe and header heat shields on the weekend.